SMOD logic help!

Question

Hi
We are using the following logic to enhance 2lis_02_itm with different fields from diff tables. We could able to see the enahnced field data in RSA3 , but after making any change in ME22n its not pulling those changes. can anybody advice where is my mistake here ?
*&  Include           ZXM06U16
DATA: i_t_ekpo LIKE ekpo OCCURS 1 WITH HEADER LINE,
      i_t_eket LIKE eket OCCURS 1 WITH HEADER LINE,
     i_t_ekpv LIKE ekpv OCCURS 1 WITH HEADER LINE,
      i_t_ekko LIKE ekko OCCURS 1 WITH HEADER LINE
DATA: ebeln LIKE ekpo-ebeln,
      ebelp LIKE ekpo-ebelp,
it_ekpo TYPE TABLE OF ekpo WITH HEADER LINE,
it_ekko TYPE TABLE OF ekko WITH HEADER LINE,
it_eket TYPE TABLE OF eket WITH HEADER LINE,
it_ekpv TYPE TABLE OF ekpv WITH HEADER LINE,
old_val(50) TYPE c. "For storing the value from the Field Symbol
FIELD-SYMBOLS <fs> TYPE ANY TABLE.
CASE zeitp.
WHEN 'MA'. "When creating a purchase order
  Filling the setup tables (Initial data load)
IF control-modus EQ 'E'.
MOVE '(SAPLEINS)T_EKPO[]' TO old_val.
ASSIGN (old_val) TO <fs>.
endif.
LOOP AT xmcekpo.
SELECT SINGLE * FROM ekpo INTO i_t_ekpo WHERE ebeln = xmcekpo-ebeln and ebelp = xmcekpo-ebelp.
SELECT SINGLE * FROM ekko INTO i_t_ekko WHERE ebeln = xmcekko-ebeln .
SELECT SINGLE * FROM eket INTO i_t_eket WHERE ebeln = xmceket-ebeln and ebelp = xmceket-ebelp.
SELECT SINGLE * FROM ekpv INTO i_t_ekpv WHERE ebeln = xmcekpv-ebeln and ebelp = xmcekpv-ebelp.
    Before image
IF xmcekpo-supkz = '1'.
xmcekpo-ZZKUNNR = i_t_ekpo-kunnr.
xmcekpo-ZZSOBKZ = i_t_ekpo-sobkz.
xmcekpo-ZZAEDAT = i_t_ekko-aedat.
xmcekpo-ZZEINDT = i_t_eket-eindt.
xmcekpo-ZZMENGE   = i_t_eket-menge.
xmcekpo-ZZGLMNG = i_t_eket-glmng.
xmcekpo-ZZALTDT = i_t_eket-altdt.
xmcekpo-ZZVSTEL = i_t_ekpv-vstel.
xmcekpo-ZZLEDAT = i_t_ekpv-ledat.
xmcekpo-ZZPLIFZ = i_t_ekpv-plifz.
xmcekpo-ZZVKORG = i_t_ekpv-vkorg.
xmcekpo-ZZVTWEG = i_t_ekpv-vtweg.
xmcekpo-ZZSPART = i_t_ekpv-spart.
    After image
ELSEIF xmcekpo-supkz = '2'..
READ TABLE i_t_ekpo WITH KEY ebeln = xmcekpo-ebeln  ebelp = xmcekpo-ebelp.
xmcekpo-ZZKUNNR = i_t_ekpo-kunnr.
xmcekpo-ZZSOBKZ = i_t_ekpo-sobkz.
xmcekpo-ZZAEDAT = i_t_ekko-aedat.
xmcekpo-ZZEINDT = i_t_eket-eindt.
xmcekpo-ZZMENGE   = i_t_eket-menge.
xmcekpo-ZZGLMNG = i_t_eket-glmng.
xmcekpo-ZZALTDT = i_t_eket-altdt.
xmcekpo-ZZVSTEL = i_t_ekpv-vstel.
xmcekpo-ZZLEDAT = i_t_ekpv-ledat.
xmcekpo-ZZPLIFZ = i_t_ekpv-plifz.
xmcekpo-ZZVKORG = i_t_ekpv-vkorg.
xmcekpo-ZZVTWEG = i_t_ekpv-vtweg.
xmcekpo-ZZSPART = i_t_ekpv-spart.
ENDIF.
ENDLOOP.
EndCase.

Answer 1

Yes, am putting this code in a user exit and I hope thats where we have to write the code to LO enhancement for purchasing data sources i.e,
LEINS001 Statistics Update: Purchasing Documents 
User Exits: Materials Mgmt. (Purchasing)
For updating in the Purchasing Information System, only data from the purchasing documents themselves is used as a rule.
If you wish to make use of additional data for the statistics update that is not contained in the documents, then you can determine this data via the user exit EXIT_SAPLEINS_001.